The hull is still green
The hull remains velvety and protective. On some fruits it is already beginning to split, exposing part of the shell.
Astrée Field Notes · Notebook No. 1
The Almond Tree
The tree that awakens spring
Observe · Understand · Pass on
In one minute
The almond tree is a fruit tree in the genus Prunus, known for its very early blossom, often visible before the leaves are fully developed. Botanically, its fruit is a drupe: the part we eat is the seed protected by a shell. Cultivated since antiquity, the almond tree is now part of Mediterranean agricultural landscapes, including those of Aragon.
“Some trees announce spring before winter has even left the hills.”
There is a moment when the seasons seem to cross. Winter still lingers in the cool mornings, the stones retain the memory of cold nights and the olive trees carry the restrained colours of the season just gone.
Then, almost without warning, the almond trees blossom.
Their still-bare branches become covered with white or faintly pink flowers. For a few days, the hills of Les Terres d’Aragon change character. This first notebook introduces an ancient tree, familiar in dry lands and one of spring’s earliest messengers.
Identity card
Getting to know the almond tree
Scientific names usedPrunus amygdalus and Prunus dulcis
FamilyRosaceae
GenusPrunus
TypeFruit tree
Botanical fruitA drupe
Part eatenThe seed
Discovering the species
Why does the almond tree flower so early?
The almond tree’s early flowering is influenced by its genetics and local conditions. Depending on the variety, altitude and weather, flowers may open as early as late winter. They appear before or as the leaves begin to develop.
This early blossom makes the tree especially striking in the landscape, but it also exposes it to late frosts. A sudden drop in temperature can damage flowers or young fruit and reduce the harvest.
Flowers and the living world
How do flowers become almonds?
For fruit to form, pollen must reach the stigma of a compatible flower. In almond trees, this transfer is mainly carried out by visiting insects, especially bees, as they move from flower to flower in search of nectar and pollen.
Not all varieties behave in the same way. Some are self-fertile, while others require pollen from a compatible variety flowering at the same time. Weather also plays an essential role: cold, rain or wind can reduce insect activity even during abundant flowering.
From fruit to almond
How does the hull protect the almond?
After fertilisation, the flower’s ovary gradually develops into fruit. Its outer covering, known as the hull, is initially green and slightly velvety.
As the fruit ripens, the hull dries, turns brown, splits and opens naturally. This reveals the shell, the hard layer protecting the seed.
That seed is the part we commonly call the “almond”.
The brown, dried hull
Later, the hull browns and opens further. The shell becomes clearly visible as the fruit approaches harvest.
The tree’s cycle
What happens to the almond tree through the seasons?
Winter
The tree appears dormant, but its buds continue preparing. A period of accumulated cold followed by milder temperatures contributes to triggering flowering.
Late winter and spring
The flowers open, pollinators visit them and young fruits begin to form. Leaves gradually take their place along the shoots.
Summer
The fruits grow. The hull remains green at first while the shell and seed develop. Water availability and intense heat influence this period.
Late summer and autumn
The hull dries and opens when ripe. After harvest and leaf fall, the tree gradually enters another resting phase.
An ancient presence
Where does the cultivated almond tree come from?
The history of cultivated almond trees is linked to western Asia and the Mediterranean world. Their ancient domestication resulted from the gradual selection of trees producing sweet seeds, unlike the often bitter seeds of wild forms.
Through trade, migration and farming practices, the almond tree spread around the Mediterranean. In dry regions, its cultivation remains closely linked to variety choice, soil, relief, available water and frost risk.
The landscape we observe
What place does the almond tree hold in these landscapes?
The photographs gathered in this notebook come from the estate and its surroundings, across a geographical area extending from Valderrobres and Beceite to the Ebro Delta. They show almond trees standing alone or forming part of landscapes where cultivated land, spontaneous vegetation, hills, tracks and other Mediterranean trees coexist.
The almond tree is not a static part of the scenery. Its blossom briefly transforms the landscape, its leaves later give the branches a different density, and then fruit development and the drying hull make the passing stages of the season visible.
These images are field documents, but they are not always sufficient to identify a variety, determine the precise age of a tree, establish a cultivation method or date a phenomenon exactly. The notebook therefore distinguishes general knowledge from what can genuinely be observed in the photographs.
Reading a photograph
What the image shows — and what it cannot prove
- It can show the state of the flowers, the presence of leaves, the colour of the hull, the opening of the shell or the tree’s place in the landscape.
- It can suggest a stage in the seasonal cycle, provided caution is used when no date accompanies the photograph.
- It cannot always identify a variety, disease, age or cultivation method without further observation.
Key points
- The almond tree belongs to the Rosaceae family and the genus Prunus.
- Its early blossom may appear before the leaves are fully developed.
- Fruit formation depends on pollination, varietal compatibility and weather conditions.
- The fruit is a drupe; the almond we eat is its seed.
- A very bitter almond may look like any other; appearance alone cannot identify it reliably.
- At Les Terres d’Aragon, the almond tree forms part of a living Mediterranean agricultural landscape.
A living notebook
This notebook will grow with the seasons. New pages will enrich it as further observations are made at Les Terres d’Aragon.
Frequently asked questions
Common questions about almond trees
When does the almond tree blossom?
Depending on the variety, altitude and weather, flowering can begin in late winter and continue into early spring. There is no single date that applies everywhere.
Does the almond tree need pollinating insects?
Many varieties benefit greatly from visits by bees and other insects. Some varieties are self-fertile, but pollinators generally remain helpful to fruit set.
Why are late frosts dangerous?
Flowers and young fruit are sensitive to cold. A frost after the flowers have opened can reduce fruiting, sometimes severely.
Can a bitter almond be recognised by appearance?
Not reliably. A very bitter almond may look like the others and occur within the same harvest. The bitterness may be linked to a higher level of amygdalin, a naturally occurring compound that can release cyanide during digestion. An almond that tastes unusually bitter should be spat out and not swallowed. Systematic tasting is not a safe sorting method.
Is sweet almond oil always edible?
No. Cosmetic oil should not be consumed. For cooking, choose an oil explicitly sold as a food product.
Why will this notebook be expanded?
Because it connects general knowledge with real observations from Les Terres d’Aragon. Varieties, dates, work and harvest information will only be added once confirmed.
The Scribe’s perspective
Some trees wait until spring is established. The almond tree chooses to trust it before it arrives. Its blossom does not promise that the cold is over; it simply reminds us that life begins again, even while winter still hesitates.
References and sources
- Royal Botanic Gardens, Kew — Plants of the World Online, cultivated almond entry.
- University of California Agriculture and Natural Resources — technical resources on almond trees, flowering and frost risk.
- European Food Safety Authority (EFSA) — assessment of risks from cyanogenic glycosides in foods.
The collection
Discover the other Astrée Field Notes
- Notebook No. 1 — The Almond Tree
- Notebook No. 2 — The Olive Tree · coming soon
- Notebook No. 3 — The Walnut Tree · coming soon
- Notebook No. 4 — The Hazel · coming soon
- Notebook No. 5 — The Apple Tree · coming soon
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